JPS6241894A - Chemical injecting method of propulsion reaching section ground of shaft for method of propulsion construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides for the construction of water supply sheath pipes, sewer pipes,
The present invention relates to a method for injecting chemical liquid into the ground at the starting or reaching part of a starting or reaching shaft, which is used when propelling and laying cable sheath pipes and other pipe bodies for various purposes.

[Prior art]

Conventionally, as a construction method for propelling and laying pipes underground, a shaft with a starting opening and a shaft with a reaching opening are sunk underground, and a propulsion device installed in the starting shaft is used to move the pipe. A construction method is known in which the vehicle is propelled into the ground through the starting opening and reaches the reaching opening in the reaching shaft.

When implementing this construction method, if the ground near the starting or reaching part of the shaft is soft, earth and sand will enter the shaft from the opening of the shaft. In this measure and 1 to 1, a drilling/chemical injection device is installed on the ground, and after drilling from the ground to an appropriate depth underground, a ground strengthening chemical is injected.

However, in the case of the conventional chemical injection method, a drilling and chemical injection device is installed on the ground to perform drilling and chemical injection work, so a large work space is required around the shaft on the ground. It is difficult to reliably inject the chemical solution only to the ground in front of the starting opening or the reaching opening, and because the chemical solution is injected to places other than where it is needed, there is a lot of wasteful consumption of the chemical solution, which is uneconomical. be.

[Purpose and structure of the invention]

The purpose of this invention is to provide a method for injecting chemical liquid into the ground at the starting and reaching part of a vertical shaft for propulsion construction, which can advantageously solve the above-mentioned problems. One end of the holding member B surrounding the through hole 2 provided in the surrounding wall is fixed to the inside of the surrounding wall of the steel shaft 1, and the drilling and chemical injection device 4 is fixed to the other end of the holding member 3. Next, the drilling injection rod 5 of the drilling/chemical injection device 4 is inserted into the ground through the through hole 2 while rotating, and then the chemical solution for soil reinforcement is inserted into the ground through the drilling injection rod 5. This invention relates to a method for injecting chemical liquid into the ground at the starting point of a vertical shaft for propulsion construction.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 5 show the state in which the drilling/chemical injection device 4 is placed at a predetermined position in the steel vertical shaft 1,
A through hole 2 for inserting a piercing injection rod is bored at a predetermined position on the peripheral wall of the cylindrical steel vertical shaft 1, and one end portion of a steel holding member 6 made of a flange-shaped cylinder surrounding the through hole 2 is provided in the peripheral wall. are fixed by welding, and the front end of the frame 6 of the drilling/chemical injection device 4 is overlapped with the other end of the holding member 3 via a comb sealing material 7 and fixed with bolts 8.

The structure of the perforation/chemical injection device 4 will be explained as follows.
A guide rod 9 extending parallel to the drilling injection rod 5 is installed and fixed on the frame B, and a feed screw rod 10 extending parallel to the drilling injection rod 5 is mounted on a bearing 11 by the frame 6.
A handle 12 is fixed to the end of the feed screw 10, and a female screw portion of a movable frame 14 to which a rotational drive device 13 consisting of an electric motor with a reduction gear or a hydraulic motor is fixed is connected to the female screw portion of the movable frame 14. The guide rod 9 is slidably fitted into the movable frame 14 while being screwed into the feed screw 10, and the drive gear 15 fixed to the output shaft of the rotational drive device 13 is fixed to the drilling injection rod 5. The driven gear 16 is rotatably supported by the movable frame 14 via a bearing, and the base end of the perforated injection rod 5 is connected to a chemical supply source via a hose 17. A swivel device 18 is fitted therein.

The perforated injection rod 5 has a cutting tool 19 at its tip and has a liquid passage hole that extends over almost the entire length of the rod, and the liquid passage hole is connected to a swivel device 18 and extends around the tip of the perforated injection rod 5. Alternatively, the cutting tool 19 is opened around the cutting tool 19, the guide rod 9 is fitted into the rubber sealing material 7, and the cutting tool 19 is disposed within the holding member 6.

When a steel shaft 1 is sunk and a chemical solution is injected, a through hole 2 is drilled without cutting, the shaft 1 with a holding member 3 attached is placed on the ground, and the ground below the shaft 1 is excavated and discharged. At the same time, the shaft 1 is lowered into the ground until the through hole 2 reaches a predetermined depth. In this case, if the shaft 1 does not sink naturally even after excavating and discharging the earth and sand in the shaft 1, a load is placed on the upper part of the shaft 1 to cause it to sink.

Note that the shaft 1 may be lowered after several temporary covers 1 are placed on the other end of the holding member 3, or the shaft 1 without a through hole 2 may be sunk to a predetermined depth underground, and then the shaft 1 may be lowered. The through hole 2 may be bored at a predetermined position in the peripheral wall 1 and the holding member 3 may be fixed.

Next, after fixing the front end of the frame 6 of the drilling/chemical injection device 4 to the holding member 3, the rotation drive device 13 is operated to rotate the drilling injection rod 5 while the handle 1
2 rotates the feed screw 10 and moves the drilling injection rod 5 forward via the movable frame 14 and the driven gear 16, thereby drilling into the ground in front of the through hole 2, as shown in FIG. , and the chemical solution for soil reinforcement is applied to the hose 17.
゜Through the swivel device 18 and the liquid passage hole in the perforation injection rod 5, the liquid flows around the tip of the perforation injection rod 5 or the cutting tool 1.
It is injected into the ground through the opening around No. 9 and allowed to seep into the ground. After injecting and penetrating the chemical into the ground in this way and forming the reinforced ground 20 as shown in FIG. 7, the drilling and chemical injection device 4
a starting opening or a reaching opening 21 for removing the shaft and cutting the circumferential wall of the shaft around the through hole 2 to a required size to propel the tube from inside the shaft toward the ground.
will be established.

When carrying out this invention, the ground at the planned starting position of the tube may be strengthened by drilling multiple holes in parallel at appropriate intervals from the vicinity of the planned starting position of the tubular body, and injecting a chemical solution. Further, the chemical solution may be injected into the ground while drilling with the drilling injection rod 5, or the chemical solution may be injected into the ground while drilling is completed and the drilling injection rod 5 is pulled out.

〔Effect of the invention〕

According to this invention, one end of the holding member 3 surrounding the through hole 2 provided in the surrounding wall is fixed to the inside of the surrounding wall of the steel shaft 1 sunk underground, and the other end of the holding member 3 is fixed to the inside of the surrounding wall of the steel shaft 1 sunk underground. The drilling/chemical injection device 4 is fixed, then the drilling injection rod 5 of the drilling/chemical injection device 4 is inserted into the ground through the through hole 2 while rotating, and then the ground strengthening chemical is applied. Since it is injected into the ground through the drilling injection rod 5, the drilling and chemical injection device 4 can be accurately set in a predetermined position using the steel vertical shaft 1, without installing the drilling and chemical injection device on the ground. It is possible to drill holes for chemical injection reservoirs and inject chemical liquids without using a large area on the ground.
In addition, since the chemical solution can be injected mainly only into the underground pipe where it is expected to start or reach, it is possible to obtain effects such as preventing a large amount of the chemical solution from being wasted.

[Brief explanation of drawings]

Figure 1 is a partially vertical schematic side view showing a drilling and chemical injection device set at a predetermined position in a shaft sunk underground;
Figure 2 is an enlarged vertical side view of a part of Figure 1;
The figure is a partial cross-sectional plan view of the part shown in Figure 2, and Figure 4 is a partial cross-sectional plan view of the part shown in Figure 2.
5 is a longitudinal side view enlarging a portion of FIG. 2; FIG. 6 is a partially longitudinal side view showing the state in which drilling and chemical injection are being performed; The figure is a longitudinal sectional view showing a state in which a starting opening or a reaching opening is provided in the shaft after the ground has been strengthened by chemical injection (7). In the figure, 1 is a steel shaft, 2 is a through hole, 3 is a holding member,
4 is a perforation and chemical injection device, 5 is a perforation injection rod, 6 is a frame, 7fd rubber sealing material, 8 is a bolt, 9 is a guide rod, 1o is a feed line rod, 12 is a handle, 16 is a rotation drive device, 14 is a movable frame, 17 is a hose, 1
8 is a swivel device, 19 is a cutting tool, 2o is a reinforced ground, 2
1 is a starting opening or a reaching opening.

Claims (1)

[Claims] One end of a holding member 3 surrounding a through hole 2 provided in the surrounding wall is fixed to the inside of the surrounding wall of a steel vertical shaft 1 sunk underground, and a drilling/chemical injection device 4 is attached to the other end of the holding member 3. fixed,
Next, the drilling injection rod 5 of the drilling/chemical injection device 4 is inserted into the ground through the through hole 2 while rotating,
A method for injecting a chemical solution into the ground at the starting point of a shaft for propulsion construction, characterized in that a chemical solution for ground reinforcement is then injected into the ground through the perforation injection rod 5.